{"id":"F2006B03306","name":"AD/B767/125 - Oxygen Masks","slug":"ad-b767-125-oxygen-masks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42743,"registerId":"commonwealth-F2006B03306-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/B767/125 Oxygen Masks 10/2000","sectionType":"part","heading":"AD/B767/125 Oxygen Masks 10/2000","content":"# AD/B767/125 Oxygen Masks 10/2000\n\nApplicability: Model 767 series aeroplanes with line numbers 1 through 682 inclusive.\n\nRequirement: 1. Unless previously accomplished, perform a general visual inspection to determine the vendor of all oxygen masks in the passenger cabin in accordance with Boeing Service Bulletin (SB) 767-35-0033, including Appendix A, dated 10 September 1998. If the oxygen mask is not manufactured by Puritan-Bennett, no further action is required by this Directive for that mask.\n\nNote 1: For the purposes of this Directive, a general visual inspection is defined as: \"A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or drop-light, and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.\"\n\n    2. If the oxygen mask is manufactured by Puritan-Bennett, or if the manufacturer of the mask cannot be identified, perform a general visual inspection to determine the manufacturing date of the oxygen mask, in accordance with the applicable service bulletin. For each oxygen mask manufactured by Puritan-Bennett, or an unidentified manufacturer, if the mask was manufactured between May 1986 and July 1998 inclusive or if the manufacturing date cannot be determined accomplish either of the following:\n\n    Replace the lanyards on the masks with new lanyards in accordance with SB 767-35-0033, including Appendix A.\n\n    b. Replace the existing oxygen mask with a new mask that was manufactured by Puritan-Bennett before May 1986 or after July 1998, or by another vendor, and that has the same Boeing part number, or that is approved by the United States Federal Aviation Administration (FAA) for installation as an alternative to the Puritan-Bennett mask.\n\n    3. No person shall install an oxygen mask manufactured by Puritan-Bennett between May 1986 and July 1998 inclusive, on any aeroplane, unless the lanyard has been replaced with a new lanyard in accordance with Requirement 2. B of this Directive.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive remains narrowly focused on correcting an identified unsafe condition in passenger oxygen masks on early Boeing 767 aircraft. It requires inspection and either lanyard replacement or mask replacement for Puritan-Bennett masks from May 1986–July 1998 (and masks with unknown maker/date), and forbids installing affected masks unless the lanyard has been replaced. This is consistent with a targeted safety-correction measure rather than an expansion beyond the original safety purpose. The AD relies on the Boeing service bulletin for technical detail and does not broaden the affected fleet, parts, or corrective choices beyond those safety-driven steps (Applicability; Requirements 1–3; Note 1)."},"complexity_factors":["Limited applicability: single aircraft type (Boeing 767), line numbers 1–682.","Small number of operative requirements (three requirements plus one definitional note).","Reference to external Boeing Service Bulletin (SB 767-35-0033, incl. Appendix A) for inspection and replacement procedures—requires cross-checking external document.","Conditional logic: action depends on vendor identification and manufacturing date (if Puritan-Bennett, or maker/date unknown, then follow Requirement 2).","Two alternative corrective actions permitted (replace lanyard OR replace mask) with additional conditions for replacement masks (same Boeing part number or FAA-approved alternative).","Prohibition on installation (Requirement 3) creates an ongoing compliance obligation for future maintenance.","Ambiguity points that increase implementation steps: identification of manufacturer and manufacturing date, and handling masks with unknown date/manufacturer."],"plain_english_summary":"**What this directive does (mechanically)\n\n- Applies to: Boeing Model 767 aircraft, line numbers 1–682 (see \"Applicability\").\n\n- Step 1 (inspection): Operators must do a general visual inspection of every passenger oxygen mask to identify who made the mask (Requirement 1; Note 1). A \"general visual inspection\" means looking for obvious damage or irregularity in normal lighting; you may need ladders or to open panels (Note 1).\n\n- Step 2 (if the mask is Puritan-Bennett or the maker cannot be identified): Operators must inspect the mask to determine its manufacturing date (Requirement 2). For any mask made by Puritan-Bennett between May 1986 and July 1998 inclusive — or any mask whose date cannot be determined — the operator must do one of the following (Requirement 2):\n  - replace the mask's lanyard with a new lanyard in accordance with Boeing Service Bulletin (SB) 767-35-0033 (including Appendix A); or\n  - replace the entire mask with a replacement that is either a Puritan-Bennett mask manufactured before May 1986 or after July 1998, or a mask from another vendor that has the same Boeing part number or is FAA-approved as an alternative (Requirement 2b).\n\n- Step 3 (installation prohibition): No one may install a Puritan-Bennett mask manufactured between May 1986 and July 1998 on any aeroplane unless the mask's lanyard has first been replaced as required above (Requirement 3).\n\n\nWhy it matters (stated purpose and what that implies)\n\n- The directive is a safety requirement (an Airworthiness Directive) issued by the Civil Aviation Safety Authority delegate to correct an identified unsafe condition. The stated mechanism is to identify potentially affected masks and either renew the lanyard or replace the mask so that an identified defect or risk is mitigated (see Requirement 1–3).\n\n\nWho pays, who decides, what behaviour changes\n\n- Who pays: Aircraft owners/operators are responsible for carrying out the inspections and for the cost of replacement lanyards or masks (Requirements 1–3, and SB reference). Those costs include parts, labour, and any aircraft downtime while the work is done.\n\n- Who decides: The CASA delegate issued the AD and sets the mandatory requirements; operators must follow the Boeing Service Bulletin procedures referenced in the AD for how to carry out inspections and replacements (Requirement 1–2; SB 767-35-0033 referenced throughout).\n\n- Behaviour change required: Operators must inspect every passenger oxygen mask to identify vendor and manufacture date; where masks are Puritan-Bennett from the specified date range (or date unknown), operators must either replace the lanyard or replace the mask. Operators must not install the affected Puritan-Bennett masks unless their lanyards have been replaced (Requirement 3).\n\n\nImplementation features, trade-offs and practical considerations\n\n- Reliance on a service bulletin and FAA approvals: The AD requires compliance \"in accordance with\" Boeing SB 767-35-0033 and allows FAA-approved alternatives (Requirement 1–2). That means operators must follow Boeing's specified procedures and, where choosing replacement masks, ensure any non-Puritan-Bennett parts are FAA-approved alternatives.\n\n- Identification difficulty and compliance burden: Operators may face non-trivial work identifying mask vendor and manufacturing date for every passenger mask. When the manufacturer or date cannot be determined, the AD treats the mask as potentially unsafe (Requirement 2). That increases inspection and replacement workload.\n\n- Direct costs and opportunity cost: Costs are concentrated on aircraft operators (parts, labour, possible aircraft downtime). The benefit is a targeted safety correction for a specific supplier/date-range; the AD channels demand toward alternative masks or replacement lanyards (Requirement 2b).\n\n- Market effect and supplier incentives: By singling out Puritan-Bennett masks from a particular production period, the AD creates extra demand for replacement lanyards and for masks manufactured outside the date range or by other vendors (Requirement 2). This can benefit suppliers of compliant parts; operators must ensure replacements meet Boeing part numbers or FAA approval.\n\n- Risk of substitution and approvals: Operators choosing to replace masks with a non-Puritan-Bennett vendor must confirm the replacement has the same Boeing part number or FAA approval for use as an alternative (Requirement 2b). Obtaining and documenting FAA approval or compatible part numbers is an administrative step that can affect sourcing and lead times.\n\n- Enforcement and scope of action: The AD is prescriptive at the part/vendor/date level (Requirements 1–3). It gives the CASA delegate the authority to require the corrective actions and relies on the Boeing SB for technical execution. The AD does not itself set deadlines in the text shown here; compliance timing is set out in the compliance section referenced by the AD (see top paragraph describing when actions must be done).\n\n\nNet practical summary\n\n- Operators of applicable Boeing 767s must inspect passenger oxygen masks to find any Puritan-Bennett units made May 1986–July 1998 (or units with unknown maker/date) and either fit new lanyards or replace the mask with an approved alternative. They cannot fit an affected Puritan-Bennett mask unless the lanyard has been replaced. The direct costs fall on operators; the practical challenges are identification, parts sourcing (FAA-approved alternatives), and scheduling the maintenance work (Requirements 1–3; Note 1; Boeing SB reference)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: addressing a specific manufacturing defect in oxygen masks for a specific aircraft type. It has not expanded beyond its initial safety purpose."},"complexity_factors":["Single-issue directive with clear conditional logic (if/then structure)","Only 1 defined term ('general visual inspection') with explicit definition provided","Minimal cross-referencing (references one Boeing Service Bulletin and one regulation)","Straightforward applicability (specific aircraft model and serial number range)","Clear compliance pathway with two alternative remedies (replace lanyard OR replace mask)","No nested exceptions or complex temporal triggers beyond the manufacturing date window"],"plain_english_summary":"This CASA safety order requires Boeing 767 owners/operators (S/N 1–682) to inspect passenger oxygen masks and identify any Puritan-Bennett units. Masks manufactured May 1986–July 1998 (or of unknown origin) must have their lanyards replaced or the entire mask swapped for a compliant unit.  \n\nIt also bars installing affected Puritan-Bennett masks unless the lanyard has been replaced — action aimed at ensuring masks deploy reliably in depressurisation emergencies."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-125-oxygen-masks","history":"/api/acts/ad-b767-125-oxygen-masks/history","analysis":"/api/acts/ad-b767-125-oxygen-masks/analysis","conflicts":"/api/acts/ad-b767-125-oxygen-masks/conflicts","importantCases":"/api/acts/ad-b767-125-oxygen-masks/important-cases","documents":"/api/acts/ad-b767-125-oxygen-masks/documents"}}